The hypothesis behind Svelte is straightforward: Browser-based UI frameworks result in a lot of overhead; it is possible to remove this overhead by handling the framework in a build step outside of the browser. Svelte doesn’t have a virtual DOM.
It’s a compiler, not a dependency.
Frameworks like Vue and React are dependencies; they interact with your code while it executes. Svelte is a compiler; it interacts with your code before you ever put that code in production — Svelte outputs vanilla JavaScript.
Svelte Web Interfaces with Svelte dev.to/jacobherrington/svelte-web-interfaces-with-svelte-44ib